World's Best Cat Litter is the strongest all-around pick in this comparison for eco-conscious owners who want flushable litter.
A budget-friendly clay litter with aggressive odor control and easy store availability, offset by strong fragrance and more tracking.
Flushable, lightweight, and eco-friendly corn litter with surprisingly strong clumping for a natural option.
Clump & Seal is the cheap perfumed clay. World's Best is the flushable corn litter with no added scent. The daily gap between them is much smaller than the bag prices make it look.
This comparison page is maintained by the ReviewCatLitter editorial team and grounded in the same scoring framework used across the published review catalog.
Choose between them on texture, clumping, dust and price. Then, if the room still tells you where the box is, Purrify is activated carbon you mix into whichever bag you chose. It is what we use in our own homes.
Read our Purrify guide to picking a litter for odor control.
Every figure below is a reading from our own test runs, not a rating. Where a run never took a reading it says so.
| Reading | Arm & Hammer Clump & Seal | World's Best Cat Litter | Gap |
|---|---|---|---|
| Dust weighed per pourDust caught on a filter and weighed while the bag goes into the box. Lower is better. | 0.45 mg | 0.15 mgbetter | 0.30 mg |
| Clumps that survived the drop testShare of clumps still whole after a three-foot drop. Higher is better. | not measured | 76% | only one side measured |
| Ammonia after one dayParts per million above the tray, 24 hours in. Lower is better. | 1 ppmbetter | 2 ppm | 1 ppm |
| Ammonia after three daysParts per million above the tray, 72 hours in. Lower is better. | 3 ppm | not measured | only one side measured |
| Bag priceWhat the tested bag cost. Bag sizes differ, so read it next to cost per pound. | $16.99 | $29.99 | $13.00 |
| Cost per poundBag price divided by what is in the bag. Lower is better. | $0.45better | $1.07 | $0.62 |
| Cost per dayWhat the box costs to keep running each day. Lower is better. | $0.43better | $0.58 | $0.15 |
| Cost across a yearThat daily cost carried over a full year of use. Lower is better. | $157better | $212 | $55 |
Neither run recorded granules outside the box, so those rows are left out rather than filled in from a similar bag. The full test data shows every reading we have.
Primary tradeoff: World's Best Cat Litter's weakest area here is value.
Best dust control here at 0.15mg per pour.
Clumping is a real edge: excellent for corn.
It still lands a stronger overall score than cheaper options because it is more balanced.
Scroll sideways to see every litter. Scores are editorial judgments out of 10.
| Product | ||
|---|---|---|
| Overall Score | 8.7Very good | 9.1Excellent |
| Pricing | ||
| Price | $16.99 | $29.99 |
| Weight | 38 lbs | 28 lbs |
| Cost / Day | $0.43 | $0.58 |
| Performance | ||
| Dust Control | 6 0.45mg per pour | 7.8 0.15mg per pour |
| Clumping | 8.1 Good | 9 Excellent for corn |
| Odor Control | 9.1 7-day heavy fragrance | 8.2 Good with daily scooping |
| Tracking Outside the Box | 6 Tracks heavily | 9 Minimal |
| Value for Cost | 9 $0.43/day · $16.99 | 7.2 $0.58/day · $29.99 |
| Features | ||
| Type | Scented Clumping Clay | Corn Litter |
| Flushable | ||
| Scented | Yes | No |
| Our Verdict | ||
| Best For | Budget shoppers prioritizing odor control | Eco-conscious owners who want flushable litter |
| Read ReviewCheck Price | Read ReviewCheck Price | |
Arm & Hammer Clump & Seal makes the most sense for budget shoppers prioritizing odor control.
You want a budget-friendly clay litter with aggressive odor control and easy store availability, offset by strong fragrance and more tracking.
You need a formula that solves eco-conscious owners who want flushable litter better.
World's Best Cat Litter makes the most sense for eco-conscious owners who want flushable litter.
You want eco-friendly and flushable litter with very good daily usability.
You're on a tight budget or want the absolute lowest dust numbers.
The nearest options to this matchup on score and on price.
Weighed 0.11mg per pour and runs at $0.63 a day.
Weighed 0.04mg per pour and runs at $0.55 a day.
Weighed 0.15mg per pour and runs at $0.72 a day.
World's Best Cat Litter comes out ahead on the balance of dust, clumping, odor control, tracking and daily cost. Arm & Hammer Clump & Seal is still the one to buy for budget shoppers prioritizing odor control.
Arm & Hammer Clump & Seal runs at $0.43 a day against $0.58 for World's Best Cat Litter.
Arm & Hammer Clump & Seal scored higher: 7-day heavy fragrance, against good with daily scooping for World's Best Cat Litter.
World's Best Cat Litter keeps more litter in the box: minimal, against tracks heavily for Arm & Hammer Clump & Seal.
Choose Ultra if dust or fragrance bother anyone in the house. Choose Clump & Seal if the price of the bag decides it.
Clump & Seal is worth the step up from Tidy Cats if smell is the reason you are shopping. Tidy Cats is cheaper by the bag and easier to find.
Two perfumed supermarket clays. Clump & Seal holds smell down longer and clumps harder. Fresh Step is the cheaper bag and pours a little less dust.
Cat Attract is what you try when your cat is missing the box. Clump & Seal is what you buy when the bag price decides it.
Boxiecat is the quiet, unscented, easy-scoop bag. Clump & Seal is the cheap, heavily perfumed one.
Two Arm & Hammer clays built for different things. Clump & Seal is about fragrance and a low bag price.